@article{DE_1974_10_11_a3,
     author = {V. I. Bulatov and T. S. Kalyuzhnaya and R. F. Naumovich},
     title = {Control of the spectrum of differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1946--1952},
     publisher = {mathdoc},
     volume = {10},
     number = {11},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_11_a3/}
}